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Colorado Potato Beetle Control with Trigard, 1993

Colorado Potato Beetle Control with Trigard, 1993 Downloaded from https://academic.oup.com/amt/article-abstract/19/1/138/4639331 by DeepDyve user on 02 August 2020 138 Arthropod Management Tests, Vol. 19 E: VEGETABLE CROPS cwt/acre Grade A Grade B Total yield Treatment Rate (AI)/acre yield yield (A + B) Trigard 75WP 0.125 lb 116.46a 23.66a 140.12a Trigard 75WP 0.25 lb 110.24a 24.63a 134.88a Trigard 75WP 0.50 lb 114.45a 21.71a 136.16a Trigard 75WP 0.25 lb egg hatch 0.125 lb second spray 110.98a 19.02a 129.94a Foil BFC OF 3.00 qt product 126.34a 21.46a 147.80a Asana XL 0.04 lb + PBO +1.00 lb 128.90a 25.91a 154.82a Untreated check 51.95b 24.57a 76.52b Means in a column with a letter in common are not significantly different (P = 0.05, Ryan's Q Test). POTATO: Solarium tuberosum L. 'Russet Burbank' Robert L. Stoltz and Nancy A. Matteson (100E) Colorado Potato Beetle; Leptinotarsa decemlineata (Say) University of Idaho District III Extension Office Twin Falls, Idaho 83301 COLORADO POTATO BEETLE CONTROL WITH TRIGARD, 1993: Experimental plots were established on the UI Research and Exten­ sion Center, Kimberly, Idaho. Potatoes were planted 11 May and irrigated by solid set sprinkler. The soil type was Portneuf silt loam. Three Trigard treatments, Asana as a commercial standard, and an untreated check plot were replicated four times in a randomized complete block design. Individual treatment plots were 2 rows (36 inch row spacing) wide by 25 ft long with 5 ft alleyways separating the plots. Applications were made as a broadcast spray using a C0 pressurized backpack sprayer. Twenty gal of finished spray/acre applied (30 psi, four, 10X hollow cone nozzles) to all plots. Pre- treatment counts of all beetle stages were made on 1 Jul and the first application at 10% egg hatch was made on 2 Jul. The second application was made 19 Jul. On a weekly basis, egg masses, small larvae (1—2 instar), large larvae (3^1 instar) and adult beetles were counted and percent defoliation estimates were made visually from whole plant inspections of the center five hills of both plot rows. Data were analyzed using ANOVA and Newman- Keuls. Defoliation was significantly reduced by all treatments during the entire test period. This is in contrast to the lack of mortality of small larvae. There was significant control of large larvae with all three Trigard treatments. Trigard, an insect growth regulator (IGR), appeared to interfere with the molting and maturation of small instar larvae to the later instars. Small larvae were frequently observed bleeding and having cast skins still attached to the posterior ends. Consequently, defoliation was significantly reduced despite the presence of small larvae. Mean no. small larvae/10 plants Pre- Rate g Placement methods treatment Treatment (AI)/acre (Foliar spray) 1 Jul 8 Jul 15 Jul 22 Jul 30 Jul 9 Aug 16 Aug 23 Aug Untreated check — 134.5 a 1.3 a 0.0 84.0 a 85.0 ab 40.0 a 14.0 a 1.8 a 140 At egg hatch and 6.5 a 0.8 a 0.5 a 0.0 Trigard 75WP 96.0 a 82.0 a 124.0 b 33.5 a 140 14 days later Trigard 75WP 280 At egg hatch 129.8 a 140.5 a 44.8 ab 53.5 a 9.5 a 8.8 a 1.3 a 0.0 Trigard 75WP 280 At egg hatch and 99.5 a 154.0 a 85.3 ab 52.3 a 2.5 a 0.5 a 0.3 a 0.0 140 14 days later Asana XL 22.7 At egg hatch 144.5 a 17.0 a 3.0 a 1.0 a 0.5 a 12.8 a 6.5 a 0.0 Mean no. large larvae/10 plants Pre- treat- Placement methods Rate g ment Treatment (AI)/acre (Foliar spray) 1 Jul 8 Jul 15 Jul 22 Jul 30 Jul 9 Aug 16 Aug 23 Aug Untreated check 0.0 26.3 b 33.5 b 82.8 b 12.0 a 5.8 a 1.0 a 0.0 Trigard 75WP 140 At egg hatch and 0.0 4.3 a 10.5 a 9.5 a 1.3 a 0.5 a 0.0 a 0.0 140 14 days later Trigard 75WP 280 At egg hatch 0.0 7.8 a 5.3 a 27.0 a 6.8 a 3.3 a 3.3 a 0.0 Trigard 75WP At egg hatch and 0.0 6.0 a 6.0 a 13.3 a 1.8 a 0.0 a 1.0 a 0.0 14 days later Asana XL 22.7 At egg hatch 0.0 0.0 a 0.0 a 1.0 a 0.0 a 6.0 a 2.8 a 0.0 Downloaded from https://academic.oup.com/amt/article-abstract/19/1/138/4639331 by DeepDyve user on 02 August 2020 E: VEGETABLE CROPS Arthropod Management Tests, Vol. 19 139 % Defoliation Pre- treat- Rate g Placement methods ment (AI)/acre (Foliar spray) 8 Jul 15 Jul 22 Jul 30 Jul 9 Aug 16 Aug 23 Aug Treatment 1 Jul Untreated check 0.0 3.3 b 6.8 b 12.0 b 22.5 b 52.5 b 68.8 b 86.3 b Trigard 75WP 140 At egg hatch and 0.0 0.8 a 0.8 a 1.0 a 1.3 a 3.8 a 3.8 a 32.5 a 140 14 days later Trigard 75WP 0.8 a 2.0 a 5.0 a 9.0 a 3.8 a 17.5 a 280 At egg hatch 0.0 1.3 a Trigard 75WP 1.3 a 1.3 a 0.8 a 7.0 a 18.8 a 45.0 a 280 At egg hatch and 0.0 1.0 a 140 14 days later Asana XL 0.0 0.0 a 0.0 a 0.0 a 0.0 a 1.3 a 2.5 a 26.3 a 22.7 At egg hatch Means within a column followed by the same letter are not significantly different at the P = 0.05 level, Newman Keuls. POTATO: Solarium tuberosum L. 'Russet Burbank' Robert L. Stoltz and Nancy A. Matteson (101E) Colorado Potato Beetle; Leptinotarsa decemlineata (Say) University of Idaho Green peach aphid; Myzus persicae (Sulzer) District III Extension Office Twin Falls, Idaho 83301 COLORADO POTATO BEETLE CONTROL WITH ADMIRE (IMIDACLOPRID), 1993: Experimental plots were established on the UI Research and Extension Center, Kimberly, Idaho. Potatoes were planted 11 May and irrigated by solid set sprinkler. The soil type was Portneuf silt loam. Three treatments and one untreated check plot were replicated four times in a randomized complete block design. Individual treatment plots were 4 rows (36 inch row spacing) wide by 25 ft long with 5 ft alleyways separating the plots. Three application methods of the emulsifiable concentrate (2EC) were tested at a single rate of 0.25 pounds active ingredient per acre. The first method was an in-furrow spray application over the seed piece at planting. The second method was a six inch banded spray over the row at planting and prior to bedding. The third application method was a shank application approximately three inches on either side of and two to three inches below the seed piece. The first and second application methods were made at planting on 7 May. Due to weather constraints application method three was made on 11 May. On a weekly basis, egg masses, small larvae (1-2 instar), large larvae (3^1 instar) and adult beetles were counted and percent defoliation estimates were made from whole plant inspections of the center five hills of the center two plot rows. Weekly counts of green peach aphids were made beginning on 7 Jul by examining six leaves from each plot. Plots were harvested on 21 Sept for yield and grade by taking a single 25 foot row from each plot. Data were analyzed using ANOVA and Newman-Keuls. All three application methods provided season long control of all stages of Colorado potato beetle and control of green peach aphid through 1 Aug. Windy conditions may affect the efficacy of the over the row spray. We feel the in-furrow or shank applications would provide less chance of environmental contamination compared to a band exposed on top of the row. Rate lb Mean no. small larvae/10 plants (AI)/ Placement Treatment acre methods 21 Jun 28 Jun 6 Jul 12 Jul 19 Jul 26 Jul 2 Aug 9 Aug 16 Aug Untreated check 37.8 b 183.3 b 236.8 b 104.0 b 32.5 b 3.8 b 0.0 113.5 b 0.0 Admire 2EC 0.25 In furrow 0.0 a 0.0 a 0.0 a 0.0 a 0.0 a 0.0 a 0.0 0.0 a 0.0 0.0 a 0.0 a 0.0 a Admire 2EC 0.25 Over row 0.0 a 0.0 a 0.0 a 0.0 a 0.0 0.0 Admire 2EC 0.25 Shanked 0.0 a 0.0 a 0.0 a 0.0 a 0.0 a 0.0 a 0.0 0.0 a 0.0 Rate lb Defoliation (AI)/ Placement Treatment acre methods 21 Jun 28 Jun 6 Jul 12 Jul 19 Jul 26 Jul 2 Aug 9 Aug 16 Aug Untreated check 0.0 3.3 b 42.5 b 52.5 b 65.0 b 87.5 b 0.0 16.3 b 35.0 b Admire 2EC 0.25 In furrow 0.0 0.0 a 0.0 a 0.0 a 0.0 a 0.0 a 0.0 0.0 a 0.0 a Admire 2EC 0.25 Over row 0.0 0.0 a 0.0 a 0.0 a 0.0 a 0.0 a 0.0 0.0 a 0.0 a Admire 2EC 0.0 0.0 a 0.0 a 0.25 Shanked 0.0 0.0 a 0.0 a 0.0 a 0.0 a 0.0 a Mean no. green peach Rate lb aphid/6 leaves (AI)/ Placement Treatment acre 29 Jul 9 Aug 16 Aug methods Untreated check 30.0 b 49.5 a 21.8 a Admire 2EC 0.25 In furrow 0.5 a 42.8 a 15.3 a Admire 2EC 19.3 a 0.25 Over row 0.0 a 30.5 a Admire 2EC 0.25 47.0 a 18.3 a Shanked 1.8 a Means within a column followed by the same letter are not significantly different at the P = 0.05 level, Newman-Keuls. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Colorado Potato Beetle Control with Trigard, 1993

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Oxford University Press
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© 1994, Entomological Society of America
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2155-9856
DOI
10.1093/amt/19.1.138
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Abstract

Downloaded from https://academic.oup.com/amt/article-abstract/19/1/138/4639331 by DeepDyve user on 02 August 2020 138 Arthropod Management Tests, Vol. 19 E: VEGETABLE CROPS cwt/acre Grade A Grade B Total yield Treatment Rate (AI)/acre yield yield (A + B) Trigard 75WP 0.125 lb 116.46a 23.66a 140.12a Trigard 75WP 0.25 lb 110.24a 24.63a 134.88a Trigard 75WP 0.50 lb 114.45a 21.71a 136.16a Trigard 75WP 0.25 lb egg hatch 0.125 lb second spray 110.98a 19.02a 129.94a Foil BFC OF 3.00 qt product 126.34a 21.46a 147.80a Asana XL 0.04 lb + PBO +1.00 lb 128.90a 25.91a 154.82a Untreated check 51.95b 24.57a 76.52b Means in a column with a letter in common are not significantly different (P = 0.05, Ryan's Q Test). POTATO: Solarium tuberosum L. 'Russet Burbank' Robert L. Stoltz and Nancy A. Matteson (100E) Colorado Potato Beetle; Leptinotarsa decemlineata (Say) University of Idaho District III Extension Office Twin Falls, Idaho 83301 COLORADO POTATO BEETLE CONTROL WITH TRIGARD, 1993: Experimental plots were established on the UI Research and Exten­ sion Center, Kimberly, Idaho. Potatoes were planted 11 May and irrigated by solid set sprinkler. The soil type was Portneuf silt loam. Three Trigard treatments, Asana as a commercial standard, and an untreated check plot were replicated four times in a randomized complete block design. Individual treatment plots were 2 rows (36 inch row spacing) wide by 25 ft long with 5 ft alleyways separating the plots. Applications were made as a broadcast spray using a C0 pressurized backpack sprayer. Twenty gal of finished spray/acre applied (30 psi, four, 10X hollow cone nozzles) to all plots. Pre- treatment counts of all beetle stages were made on 1 Jul and the first application at 10% egg hatch was made on 2 Jul. The second application was made 19 Jul. On a weekly basis, egg masses, small larvae (1—2 instar), large larvae (3^1 instar) and adult beetles were counted and percent defoliation estimates were made visually from whole plant inspections of the center five hills of both plot rows. Data were analyzed using ANOVA and Newman- Keuls. Defoliation was significantly reduced by all treatments during the entire test period. This is in contrast to the lack of mortality of small larvae. There was significant control of large larvae with all three Trigard treatments. Trigard, an insect growth regulator (IGR), appeared to interfere with the molting and maturation of small instar larvae to the later instars. Small larvae were frequently observed bleeding and having cast skins still attached to the posterior ends. Consequently, defoliation was significantly reduced despite the presence of small larvae. Mean no. small larvae/10 plants Pre- Rate g Placement methods treatment Treatment (AI)/acre (Foliar spray) 1 Jul 8 Jul 15 Jul 22 Jul 30 Jul 9 Aug 16 Aug 23 Aug Untreated check — 134.5 a 1.3 a 0.0 84.0 a 85.0 ab 40.0 a 14.0 a 1.8 a 140 At egg hatch and 6.5 a 0.8 a 0.5 a 0.0 Trigard 75WP 96.0 a 82.0 a 124.0 b 33.5 a 140 14 days later Trigard 75WP 280 At egg hatch 129.8 a 140.5 a 44.8 ab 53.5 a 9.5 a 8.8 a 1.3 a 0.0 Trigard 75WP 280 At egg hatch and 99.5 a 154.0 a 85.3 ab 52.3 a 2.5 a 0.5 a 0.3 a 0.0 140 14 days later Asana XL 22.7 At egg hatch 144.5 a 17.0 a 3.0 a 1.0 a 0.5 a 12.8 a 6.5 a 0.0 Mean no. large larvae/10 plants Pre- treat- Placement methods Rate g ment Treatment (AI)/acre (Foliar spray) 1 Jul 8 Jul 15 Jul 22 Jul 30 Jul 9 Aug 16 Aug 23 Aug Untreated check 0.0 26.3 b 33.5 b 82.8 b 12.0 a 5.8 a 1.0 a 0.0 Trigard 75WP 140 At egg hatch and 0.0 4.3 a 10.5 a 9.5 a 1.3 a 0.5 a 0.0 a 0.0 140 14 days later Trigard 75WP 280 At egg hatch 0.0 7.8 a 5.3 a 27.0 a 6.8 a 3.3 a 3.3 a 0.0 Trigard 75WP At egg hatch and 0.0 6.0 a 6.0 a 13.3 a 1.8 a 0.0 a 1.0 a 0.0 14 days later Asana XL 22.7 At egg hatch 0.0 0.0 a 0.0 a 1.0 a 0.0 a 6.0 a 2.8 a 0.0 Downloaded from https://academic.oup.com/amt/article-abstract/19/1/138/4639331 by DeepDyve user on 02 August 2020 E: VEGETABLE CROPS Arthropod Management Tests, Vol. 19 139 % Defoliation Pre- treat- Rate g Placement methods ment (AI)/acre (Foliar spray) 8 Jul 15 Jul 22 Jul 30 Jul 9 Aug 16 Aug 23 Aug Treatment 1 Jul Untreated check 0.0 3.3 b 6.8 b 12.0 b 22.5 b 52.5 b 68.8 b 86.3 b Trigard 75WP 140 At egg hatch and 0.0 0.8 a 0.8 a 1.0 a 1.3 a 3.8 a 3.8 a 32.5 a 140 14 days later Trigard 75WP 0.8 a 2.0 a 5.0 a 9.0 a 3.8 a 17.5 a 280 At egg hatch 0.0 1.3 a Trigard 75WP 1.3 a 1.3 a 0.8 a 7.0 a 18.8 a 45.0 a 280 At egg hatch and 0.0 1.0 a 140 14 days later Asana XL 0.0 0.0 a 0.0 a 0.0 a 0.0 a 1.3 a 2.5 a 26.3 a 22.7 At egg hatch Means within a column followed by the same letter are not significantly different at the P = 0.05 level, Newman Keuls. POTATO: Solarium tuberosum L. 'Russet Burbank' Robert L. Stoltz and Nancy A. Matteson (101E) Colorado Potato Beetle; Leptinotarsa decemlineata (Say) University of Idaho Green peach aphid; Myzus persicae (Sulzer) District III Extension Office Twin Falls, Idaho 83301 COLORADO POTATO BEETLE CONTROL WITH ADMIRE (IMIDACLOPRID), 1993: Experimental plots were established on the UI Research and Extension Center, Kimberly, Idaho. Potatoes were planted 11 May and irrigated by solid set sprinkler. The soil type was Portneuf silt loam. Three treatments and one untreated check plot were replicated four times in a randomized complete block design. Individual treatment plots were 4 rows (36 inch row spacing) wide by 25 ft long with 5 ft alleyways separating the plots. Three application methods of the emulsifiable concentrate (2EC) were tested at a single rate of 0.25 pounds active ingredient per acre. The first method was an in-furrow spray application over the seed piece at planting. The second method was a six inch banded spray over the row at planting and prior to bedding. The third application method was a shank application approximately three inches on either side of and two to three inches below the seed piece. The first and second application methods were made at planting on 7 May. Due to weather constraints application method three was made on 11 May. On a weekly basis, egg masses, small larvae (1-2 instar), large larvae (3^1 instar) and adult beetles were counted and percent defoliation estimates were made from whole plant inspections of the center five hills of the center two plot rows. Weekly counts of green peach aphids were made beginning on 7 Jul by examining six leaves from each plot. Plots were harvested on 21 Sept for yield and grade by taking a single 25 foot row from each plot. Data were analyzed using ANOVA and Newman-Keuls. All three application methods provided season long control of all stages of Colorado potato beetle and control of green peach aphid through 1 Aug. Windy conditions may affect the efficacy of the over the row spray. We feel the in-furrow or shank applications would provide less chance of environmental contamination compared to a band exposed on top of the row. Rate lb Mean no. small larvae/10 plants (AI)/ Placement Treatment acre methods 21 Jun 28 Jun 6 Jul 12 Jul 19 Jul 26 Jul 2 Aug 9 Aug 16 Aug Untreated check 37.8 b 183.3 b 236.8 b 104.0 b 32.5 b 3.8 b 0.0 113.5 b 0.0 Admire 2EC 0.25 In furrow 0.0 a 0.0 a 0.0 a 0.0 a 0.0 a 0.0 a 0.0 0.0 a 0.0 0.0 a 0.0 a 0.0 a Admire 2EC 0.25 Over row 0.0 a 0.0 a 0.0 a 0.0 a 0.0 0.0 Admire 2EC 0.25 Shanked 0.0 a 0.0 a 0.0 a 0.0 a 0.0 a 0.0 a 0.0 0.0 a 0.0 Rate lb Defoliation (AI)/ Placement Treatment acre methods 21 Jun 28 Jun 6 Jul 12 Jul 19 Jul 26 Jul 2 Aug 9 Aug 16 Aug Untreated check 0.0 3.3 b 42.5 b 52.5 b 65.0 b 87.5 b 0.0 16.3 b 35.0 b Admire 2EC 0.25 In furrow 0.0 0.0 a 0.0 a 0.0 a 0.0 a 0.0 a 0.0 0.0 a 0.0 a Admire 2EC 0.25 Over row 0.0 0.0 a 0.0 a 0.0 a 0.0 a 0.0 a 0.0 0.0 a 0.0 a Admire 2EC 0.0 0.0 a 0.0 a 0.25 Shanked 0.0 0.0 a 0.0 a 0.0 a 0.0 a 0.0 a Mean no. green peach Rate lb aphid/6 leaves (AI)/ Placement Treatment acre 29 Jul 9 Aug 16 Aug methods Untreated check 30.0 b 49.5 a 21.8 a Admire 2EC 0.25 In furrow 0.5 a 42.8 a 15.3 a Admire 2EC 19.3 a 0.25 Over row 0.0 a 30.5 a Admire 2EC 0.25 47.0 a 18.3 a Shanked 1.8 a Means within a column followed by the same letter are not significantly different at the P = 0.05 level, Newman-Keuls.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 1994

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